Amri had been arrested earlier this year and was known to be a supporter of the terrorist group thought to be behind the Sousse terrorist attack in Tunisia, as well as being a suspected disciple of a notorious hate preacher.

The German authorities, who were on Wednesday facing serious questions about how Amri was still at large, tried to deport him in June, but because he had no valid papers proving his nationality he was allowed to stay.

Yet more pressure was piled on Angela Merkel, the German chancellor, who was already facing criticism from opponents and supporters alike over her “open door” refugee policy that allowed migrants into the country without vetting

Germany was poised to approve new surveillance laws in the hope of disrupting further attacks

Police asked for “vigilance” as they said a second attack was possible

12 of the most seriously injured people from Monday’s attack remained in hospital

A €100,000 (£84,000) reward was offered for information leading to the capture of Amri

Two Britons were treated for shock and minor injuries after being caught in the Christmas market attack.